Telephone loud-speaker



April 14 1931. Y' A. vA MARSIK 1,801,098

TELEPHONE LOUD SPEAKER Filed Jan. 4, 1928 2 Sheets-Sheet l lNvENToR wlTNEssEs' Albert VMm-sL/v BY 'y' ATTORNEY April 14, A, v MARSH( TELEPHONE LOUD SPEAKER Filed Jan. 4, 1928 2 Sheets-Sheet 2 INVENTOR I ./qlbert VTMm'sLo BY Y ATTORNEY WITNESSES Patented Apr. 14, 1931 .ALBERT Vi MARSIK, 0F JACKSON HEIGHTS, NEW YORK TELEPHONE LOUD-SPEAKER l Application filed January 4, 1928. Serial No. 244,499.

This invention relates to telephone loud speakers, an object of the invention being to provide a device of this character to which a telephone receiver may be coupled and which will amplify the sounds so that it is not necessary to hold the receiver to the ear of the user.

A device of this character is not only of advantage in that it will support the receiver and allow the sounds of the telephone to be clearly heard in ordinary social and business communications but it also lends itself for the reception of musical and other programs transmitted over the telephone.

The object therefore of the device is to provide a. telephone loud speaker which will be neat and attractive in appearance and which will most efiiciently perform the functions for which it is intended.

With these and other objects in view, the invention consists in certain novel features of construction and combinations and arrangements of parts, which will be moreV fully hereinafter described and pointed out Ain the claims.

In the accompanying drawings- Figure 1 is a view in side elevation of my improved telephone loud speaker, showing in dot and dash lines an ordinary telephone receiver in operative position thereagainst;

Figure 2 is a view in longitudinal sect-ion on a somewhat larger scale than Figure 1;

Figure 3 is a View in elevation, taken at right angles, looking at the left hand side of Figure 1;

Figure 4 is a View in transverse section on the line 4 4 of Figure 2;

Figure 5 is a view showing the electric diagram of the apparatus.

1 represents a hollow base, on which a tubular post 2 is secured, and this tubular post 2 supports a horizontally disposed cylindrical casing 3, the latter having a vertical parti- `tion 4 therein dividing the casing into two vcompartments 5 and 6, respectively.

A telephone transmitter 7 is supported in the chamber 5 at one end of the casing 3 and is preferably mounted in a ring 8 of insula tion secured on the end of casing 3 by a cap 9. The cap 9 has a recess 10 in its outer portion to accommodate the end of a telephone receiver 11, indicated by dot and dash lines in Figure 1. The end of the cap 9 also has an opening 12 therein for open communication of the sound waves between the telephone receiver and the transmitter 7.

Tn the chamber 6 of casing 3 a vibrator or lou'd speaker unit 13 is located and secured to casing 3, and a diaphragm 14 mounted in a diaphragm casing 15 is vibratcd by the unit 13 to amplify the sounds. This diaphragm 14 may be made of metal or any other suitable material and the casing 15 therefor is preferably of two parts, indicated by the reference numerals 16 and 17, forming a chamber between them to allow free movement of the diaphragm 14, and said members so constructed that when they are secured together by screws or other devices 18 they will clamp the edges of the diaphragm and securely hold the same.

lThe member 17 has an internally screwthreaded collar 39 thereon which engages the externally screw-threaded end of the casing 3, so that by turning the diaphragm casing 15 not only can it be removed from and replaced on the casing 3 but a line adjustment or spacing is had between the diaphragm and the loud speaker unit or vibrator 13.

The partition 4 in casing 3 supports a pair 3 of electric contacts 19, spaced apart, and the electric circuit between said contacts is closed by a wedge-shaped bridge piece 20 mounted on a block 21 of insulation. This block 21 is secured to the upper end of a plunger 22, and said plunger is mounted to move vertically in a housing 23 secured in the lower wall of the casing 3.

A coil spring 24 in housing 23 exerts a downward pressure on the plunger 22, normally holding the bridge piece 20 out of engagement with the contacts 19. The plunger 22 is moved upwardly by a lever 25. This lever 25 is pivotally supported between its ends on a pin or bolt 26 mounted in perforated lugs of a split ring 27 around cap 9.

The forward or outer end of this lever 25 is made somewhat hook-shaped, as shown at 28, so as to engage the under portion of the telephone receiver 11 and hold the same against the cap 9. This holding action is also Vfacilitated by a spring tongue 29 on the uppercr opposite side of the cap. In other words, the end of the telephone receiver 11 is of suicient size to force the outer or free end 28 of the lever 25 downwardly when said receiver is located in operative position in connection with my improved device, and in thus positioning the telephone receiver the lever is caused to swing on its pivot and exert an upward pressure on the plunger 22, forcing the bridge piece 2O into engagement with the contacts 19 and closingthe circuit to the operative parts of my improved apparatus. l

i llVithin the base portion l, I locate a rheostat or variable resistance apparatus 30 cont-rolled by a turn button 31 on the outside of the base,.and I employ a plug such as shown at 32 for attaching the, lead wires of the apparatus'to a battery or any desiredsource of electricity.

I have illustrated in Figure 5 an electric diagram showing the essential parts of my improved apparatus and in which 33 represents a battery or source of electricity, one pole of which is connected by a wire 34 with a contact of the loud speaker unit 13. The other contact of the loud speaker unit is connected by a wire 35 with a pole 36 of the rheostat or variable resistance device 30. The other side or pole of said rheostat is connected by wire 37 with the transmitter 7, and said transmitter connected by a wire 38 with the other pole of battery 33. In this wire conductor 38 the switch 20 is included.

I have not attempted to apply the reference characters to all of the wires illustrated in the several figures of the drawing as this only tends to cause confusion but it is understood of course that these wires function to include the several parts in circuit, as indicated by the diagram.

lVhile I have illustrated what I believe to be a. preferred embodiment of my invention it is obvious that various changes and alterations might be made in the general form of the parts described without departing from my invention and hence I do not limit myself to the precise details set forth but consider myself at liberty to make such changes and alterations as fairly fall within the spirit and scope of the appended claims.

I claim: y

l. A device of the character described, including a casing open at one end adapted to receive a telephone receiver against said open end, a diaphragm constituting the closed end of said casing, a vibrator adapted to influence the diaphragm, a transmitter in the casing adjacent its open end electrically connected and arranged to` actuate said receiver, a circuit closer in said casing, a spring pressed plunger supporting the circuit closer, and a lever adapted to be moved to clamp the telephone receiver against the casing, said lever engaging the plunger and causing the circuit closer to close the circuit when the telephone receiver is in position against the casing.

2. A device of the character described, including a hollow base, a tubular post on the base, a casing supported by the post, a transmitter in oneend of the casing, a vibrator or loudspeaker unit in the other end of the casing, a diaphragm supported by the casing and influenced by the loud speaker unit, a pair of spaced fixed contacts in the casing, a

bridge piece adapted to engage said contacts,

and a telephone receiver clamp adapted to operate said bridge piece.

Signed at New York in the county of New York and State of New York thisv3rd day of January A. D. 1928. l

ALBERT V. MARSIK. 

